debugger: Filter out debug scenarios with invalid Adapters from debug picker (#35744)

I also removed a debug assertion that wasn't true when a debug session
was restarting through a request, because there wasn't a booting task
Zed needed to run before the session.

I renamed SessionState::Building to SessionState::Booting as well,
because building implies that we're building code while booting the
session covers more cases and is more accurate.

Release Notes:

- debugger: Filter out more invalid debug configurations from the debug
picker

Co-authored-by: Remco Smits <djsmits12@gmail.com>

crates/debugger_ui/src/session/running.rs

@@ -1651,7 +1651,7 @@ impl RunningState {
 
         let is_building = self.session.update(cx, |session, cx| {
             session.shutdown(cx).detach();
-            matches!(session.mode, session::SessionState::Building(_))
+            matches!(session.mode, session::SessionState::Booting(_))
         });
 
         if is_building {